The following are known Action Replay Codes for Red Dog: Superior Firepower on SEGA Dreamcast (Dreamcast). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Have Infinite Sidearm ammo
A6435DB2
000000C8

Infinite Lives
E7A717C7
00000002

Have Infinite Health Mission 1
3FE92B13
000042C8

Have a massive score
B9D63A65
0000FFFF